The Master Builders Association is calling on the Construction, Forestry, Mining and Energy Union (CFMEU) to abandon a protest at the scene of last month's fatal wall collapse in Melbourne.

Three people, including siblings Bridget and Alexander Jones and French woman Marie-Faith Fiawoo, died when a brick wall toppled over in high winds on Swanston Street on March 28.

Grocon own the vacant lot and the Myer Emporium site, which was blockaded by the building union for 16 days and ended up in court.

CFMEU is planning to hold a rally at the wall collapse site next week to voice its concerns about safety on building sites.

But Brian Welch from the Master Builders Association says the union should not be prejudging the outcomes of the investigations into the wall collapse.

"It seems to be centred around capitalising around the misfortune, the tragedy, of the wall collapse and the unfortunate deaths of three people and it seems to be a thinly veiled attempt as an attack on Grocon," he said.